/Engine/Source/Runtime/Core/Public/Internationalization/Text.h
The overload using a custom pattern uses strftime-like syntax (seeFDateTime::ToFormattedString)
static [FText](API\Runtime\Core\Internationalization\FText) AsDate ( const [FDateTime](API\Runtime\Core\Misc\FDateTime) & DateTime, const [EDateTimeStyle::Type](API\Runtime\Core\Internationalization\EDateTimeStyle__Type) DateStyle, const [FString](API\Runtime\Core\Containers\FString) & TimeZone, const FCulturePtr & TargetCulture )